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    Not a valid Sudoku answer. Each 3x3 section has to have the digits 1-9.

    Top left 3x3 section should contain 1-9:

    5, 3, 1
    6, 2, 3
    1, 9, 1

    It contains 1 three times, 3 twice, and it's missing 4, 7, and 8.

    Top middle contains 7 twice and misses 8; top right misses 1 and 3 and has 4 and 8 twice; etc.